19 January 1974: broadcast of second episode of Invasion of the Dinosaurs. The Doctor and Sarah coordinate with the Brigadier, not realising that Mike Yates is part of the conspiracy. Once again the Doctor is threatened by a Tyrannosaurus Rex.
19 January 1982: broadcast of second episode of Four to Doomsday. The Tardis crew discover more about the plans of Monarch and the Urbankans; the humans they have met turn out to be androids.
19 January 1983: broadcast of second episode of Snakedance. The Doctor and Nyssa find more clues to the Mara in the caves; meanwhile Tegan and Lon are under its power.
19 January 1984: broadcast of first episode of The Awakening. The Doctor and Turlough, bringin Tegan to meet her grandfather, are surprised to find his village infested with Civil War soldiers and a monster in the church wall.
19 January 1985: broadcast of first episode of Vengeance on Varos. The sinister Sil persecutes the Governor, and the Doctor and Peri rescue Jondar from torture, live on television.